[Overview][Constants][Procedures and functions][Index] Reference for unit 'dateutils' (#rtl)

DaysBetween

Number of whole days between two DateTime values.

Declaration

Source position: dateutil.inc line 259

function DaysBetween(

  const ANow: TDateTime;

  const AThen: TDateTime

):Integer;

Arguments

ANow

  

First date

AThen

  

Second date

Function result

Number of whole days between ANow and AThen.

Description

DaysBetween returns the number of whole days between ANow and AThen. This means the fractional part of a day (hours, minutes, etc.) is dropped.

See also

YearsBetween

  

Calculate the number of whole years between two DateTime values

MonthsBetween

  

Calculate the number of whole months between two DateTime values

WeeksBetween

  

Calculate the number of whole weeks between two DateTime values

HoursBetween

  

Calculate the number of whole hours between two DateTime values.

MinutesBetween

  

Calculate the number of whole minutes between two DateTime values.

SecondsBetween

  

Calculate the number of whole seconds between two DateTime values.

MilliSecondsBetween

  

Calculate the number of whole milliseconds between two DateTime values.

Example

Program Example58;

{ This program demonstrates the DaysBetween function }

Uses SysUtils,DateUtils;

Procedure Test(ANow,AThen : TDateTime);

begin
 Write('Number of days between ');
 Write(DateTimeToStr(AThen),' and ',DateTimeToStr(ANow));
 Writeln(' : ',DaysBetween(ANow,AThen));
end;

Var
  D1,D2 : TDateTime;

Begin
  D1:=Now;
  D2:=Today-23/24;
  Test(D1,D2);
  D2:=Today-1;
  Test(D1,D2);
  D2:=Today-25/24;
  Test(D1,D2);
  D2:=Today-26/24;
  Test(D1,D2);
  D2:=Today-5.4;
  Test(D1,D2);
  D2:=Today-2.5;
  Test(D1,D2);
End.

Documentation generated on: Mar 17 2017